node_modules

node_modules/worker-farm/examples/pi/calc.js

@@ -0,0 +1,22 @@
+'use strict'
+
+/* A simple π estimation function using a Monte Carlo method
+ * For 0 to `points`, take 2 random numbers < 1, square and add them to
+ * find the area under that point in a 1x1 square. If that area is <= 1
+ * then it's *within* a quarter-circle, otherwise it's outside.
+ * Take the number of points <= 1 and multiply it by 4 and you have an
+ * estimate!
+ * Do this across multiple processes and average the results to
+ * increase accuracy.
+ */
+
+module.exports = function (points, callback) {
+  let inside = 0
+    , i = points
+
+  while (i--)
+    if (Math.pow(Math.random(), 2) + Math.pow(Math.random(), 2) <= 1)
+      inside++
+
+  callback(null, (inside / points) * 4)
+}